[vsnet-grb-info 21947] GRB 190330A: MITSuME Akeno and Okayama optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24047
SUBJECT: GRB 190330A: MITSuME Akeno and Okayama optical upper limits
DATE:    19/04/04 13:51:36 GMT
FROM:    Adachi Ryo at Tokyo Institute of Tech  <adachi at hp.phys.titech.ac.jp>

R. Adachi, M. Niwano, K. Iida, K. L. Murata, M. Oeda,
K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We performed tiling observation for the error region of GRB 190330A
(B. Biltzinger et al., GCN Circular #24026)
with an optical tri-color (g', Rc, and Ic) camera attached to
the MITSuME 50cm telescopes at Akeno Observatory
and Okayama Astrophysical Observatory, in Japan.

The follow up observation started at 2019-03-31 10:14:29 UT, 63,297
sec after the trigger.
Our tiling observation covered almost 100% of the Fermi-GBM Ground
Position error circle
(GCN Notices Trigger num.=575656777, record num.=58).
Compared our co-added images with GSC2.3 catalog,
we found no bright optical transient in the observed region.
Because the elevation of the target field had dropped from 50 deg to 10 deg
during the observations and the sky condition was unstable,
the obtained upper limits are different for each field.
The 5-sigma upper limits of the co-added images are listed below.

Field num.   center position(R.A., Dec.)   size of field(R.A.(arcmin)
x Dec.(arcmin))   5-sigma upper limit   start observation time(UT)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Field 0    6:03:09, +16:37:06   25.5 x 25.7   g' > 18.4, Rc > 18.2, Ic
> 17.4   10:14:29  31 March
Field 1    6:04:43, +16:36:23   25.4 x 25.7   g' > 18.6, Rc > 18.2, Ic
> 17.4   11:16:01  31 March
Field 2    6:03:13, +17:01:38   23.4 x 23.6   g' > 17.2, Rc > 16.7, Ic
> 16.4   10:58:11  31 March
Field 3    6:04:46, +17:00:37   25.5 x 25.8   g' > 18.8, Rc > 18.4, Ic
> 17.4   10:55:30  31 March
Field 4    6:03:12, +16:13:33   23.6 x 23.8   g' > 17.2, Rc > 16.8, Ic
> 16.2   10:37:03  31 March
Field 5    6:01:26, +16:36:42   25.7 x 25.8   g' > 18.1, Rc > 16.7, Ic
> 16.3   10:35:00  31 March
Field 6    6:04:51, +16:13:42   23.6 x 23.8   g' > 16.9, Rc > 16.5, Ic
> 16.7   12:01:41  31 March
Field 7    6:01:23, +17:01:33   24.1 x 24.6   g' > 17.6, Rc > 17.2, Ic
> 16.3   11:57:02  31 March
Field 8    6:06:33, +16:37:22   23.3 x 23.7   g' > 17.0, Rc > 16.4, Ic
> 16.1   11:40:32  31 March
Field 9    6:03:01, +17:24:00   25.3 x 25.8   g' > 18.4, Rc > 17.9, Ic
> 17.0   11:36:32  31 March
Field 10  6:01:30, +16:13:18   22.6 x 23.8   g' > 17.1, Rc > 16.7, Ic
> 16.8   11:19:19  31 March
Field 11  6:06:19, +17:01:13   21.8 x 23.6   g' > 18.1, Rc > 17.8, Ic
> 16.8   12:58:58  31 March
Field 12  6:04:53, +17:25:24   23.6 x 23.6   g' > 16.9, Rc > 16.1, Ic
> 16.6   12:44:02  31 March
Field 13  6:06:19, +16:13:18   22.9 x 23.9   g' > 18.1, Rc > 17.5, Ic
> 16.8   12:38:20  31 March
Field 14  6:01:30, +17:25:24   22.9 x 23.7   g' > 17.0, Rc > 16.3, Ic
> 16.8   12:22:51  31 March
Field 15  6:02:59, +15:49:25   23.8 x 24.4   g' > 17.5, Rc > 17.0, Ic
> 16.5   12:17:41  31 March
Field 16  5:59:51, +16:37:12   23.2 x 24.1   g' > 15.5, Rc > 15.5, Ic
> 15.6   13:47:37  31 March
Field 17  6:04:32, +15:48:43   19.7 x 23.0   g' > 16.7, Rc > 16.7, Ic
> 16.1   13:40:16  31 March
Field 18  5:59:51, +16:37:12   23.2 x 23.7   g' > 16.1, Rc > 15.9, Ic
> 16.2   13:26:25  31 March
Field 19  6:06:18, +17:25:00   21.2 x 23.4   g' > 17.5, Rc > 16.9, Ic
> 16.1   13:19:37  31 March
Field 20  6:01:30, +15:49:24   23.2 x 23.7   g' > 16.4, Rc > 16.1, Ic
> 16.4   13:05:12  31 March
Field 21  5:59:52, +16:13:44   23.4 x 23.8   g' > 16.6, Rc > 16.4, Ic
> 16.6   10:24:38    1 April
Field 22  6:08:11, +16:37:38   23.6 x 23.7   g' > 16.6, Rc > 16.5, Ic
> 16.8   10:45:45    1 April
Field 23  6:03:13, +17:49:19   23.5 x 23.7   g' > 15.5, Rc > 15.2, Ic
> 15.2   14:08:53  31 March
Field 24  6:08:14, +17:01:33   23.3 x 23.7   g' > 16.6, Rc > 16.5, Ic
> 16.7   11:06:53    1 April
Field 25  6:04:33, +17:48:39   19.1 x 22.7   g' > 17.0, Rc > 17.0, Ic
> 16.4   13:51:43  31 March
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

We used GSC2.3 and UCAC4 catalog for flux calibration.